Here's a little bit of the guide for you:
Brutal (58) - Just north of Deidon Hold (he'll spawn)
Medusa Butterfly (45) - Sands of Kogorh
Hermit Drill (34) - Weasand of Cados
Brucis (62) - Egothor Forest
Pterobronc (49) - Mt Temza
Fenrir (58) - Erealumen Crystallands
Poseidon (55) - Enduring Shrine of Zaude
Chimera Butterfly (50) - Quoi Woods
Griffen (59) - Northeast Yurzorea (northwest continent on the map, search the field, it spawns a bit north of the hot springs is where I found it)
The one in Quoi woods requires the level 5 sorc ring so you can burn brush to get to it, which you can get by going back to Myorzo and talking to the elder to get the first Fell Arm. Then a little ways into chapter 3, after 4 dungeons (you'll know what I mean when you finish them) go to the stone outcropping on the map southwest of the Nordopolica, the sword will react with it and you go in, the rest takes care of itself.
Level 5 ring lets you go all sorts of places blocked off previously and to get chests blocked off by rocks n brush.